function y = e_psc1(x)
%Extended PSC1 Function
%x0=[3, 0.1, ..., 3, 0.1]  
%fmin=n/2
%Author:shi yangyang
n=length(x);
m=n/2;
y=ones(1,m);
for i=1:1:m
    y(i)=(x(2*i-1)^2+x(2*i)^2+x(2*i-1)*x(2*i))^2+(sin(x(2*i-1)))^2+(cos(x(2*i)))^2;
end
y=sum(y);
